Not seeing this on gamma 0.5 on 5.4 (0,5 is under exposure so it won’t show materials a 100% correctly anyway, they will be much darker than intended)
Here is what it looks like with textures on the default settings with gamma set to 0.5
a) What version of the engine are you on?
b) Which gamma parameter are you setting?
- Global
- Shadows
- Midtones
c) Which RHI are you using
- DX11
- DX12
- Vulkan
d) Which shader model are you using?
- SM5
- SM6
e) What type of rendering are you using
Maybe the answers to the following questions might help narrow down the problem.
Also what are your color settings on your monitor output (color bit depth)
Do you have tonemapper enabled in the viewport?
You can also try to disable tonemapping with the commands in this thread
(last 2 posts mention a fix)